"Mary-Kate Olsen flashed a rare smile at a taping of ""The Late Show With David Letterman."" The actress revealed that Spencer Pratt of ""The Hills"" used to walk off the field of their high school soccer games due to his bad temper. Jennifer Mitchell/<a href=""http://www.splashnewsonline.com"" target=""new"">Splash News</a> - June 26, 2008"
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